Valve.



No. 795,220. PATENTED JULY 18,1905.

w. 0. GUNGKEL.

VALVE.

APPLICATION FILED JULY 12. 1904.

W 55555; JNVE/VTOR 5 I Wm.

UNITED STATES Patented July 18, 1905.

PATENT OFFIQE.

VALVE.

SPECIFICATION forming part of Letters Patent No. 795,220, dated July 18, 1905. Application filed July 12, 1904. Serial No. 216,210.

1 0 all whmn it may concern:

Be it known that I, I/VINFIELD O. GUNOKEL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to steam stop-valves used as safety-valves in connection with elevators or other hoisting apparatus; and it consists in the novel construction and combination of the parts hereinafter fully described and claimed.

In the drawings, Figure 1 is a vertical section through the valve. Fig. 2isa plan view of the valve. Fig. 3 is a sectional plan view of the piston-valve. Fig. 4 is a front view of the operating-lever and cam.

A is the valve-casing, and B is a seat in the upper part of the valve-casing.

C is a disk valve which closes the passage through the seat B, and D is the valve-stem.

The valve-stem D passes through a stufIing box E of any approved construction at the top of the valve-casing.

F is a piston-valve on the lower part of the valve-stem below the disk valve. This piston-valve is provided with one or more passages f, and when the valves are raised the steam can pass freely through the passage or passages f from the inlet-opening g to the outlet-opening g of the valve-casing, as indicated by the arrows in the drawings. The piston-valve is slidable in one or more packing-rings H, which are arranged in an annular recess in the lower part of the valve-casing.

I is an annular follower which supports the packing-rings in position in the recess. This follower is slidable in the recess, and c' represents bolts which prevent the follower from dropping and permit it to slide upward.

The piston-valve has asolid top and a solid bottom, and its lateral steam-passages f are closed before the disk valve C comes down onto its seat. The exact position of the piston-valve in its working cylinder when the steam is out off is not important; but when two disk valves are used, as in valves heretofore constructed, both of them must close simultaneously, and it is very diificult to prevent one or the other of the two disk valves from leaking. A single disk valve G can be ground to its seat, so that it closes steam-tight without being pressed hard onto its seat; but two disk valves on one stem cannot be made to close satisfactorily and keep in good working order. In carrying out this invention the nuts on the bolts 2' are not screwed up so as to tighten the packing, and they are only provided to keep the follower from dropping.

J is the operatinglever,which is pivoted to a pin carried by a pillar j, which projects from the upper part of the valve-casing. The lever J is connected to the valve-stem by a pin d.

K is a trip-lever which is secured to a pin it, carried by pillars is, which project upwardly from the upper part of the valve-casing.

M is a cam which turns with the trip-lever and which is arranged under the operatinglever J. A weight m is provided on the free end of the operating-lever for closing the valve. A wire a or other flexible connection is attached to the free end of the trip-lever and is conducted over suitable guide-sheaves to the top of the elevator and arranged so that when the elevator-cage is drawn up too high it will pull upon the wire. The trip-lever is normally raised, so that the operating-lever is supported by the cam and the valve is held open. The steam for working the elevator mechanism then passes freely through the valve, as indicated by the arrows. When the cage rises too high, it pulls upon the wire, thereby turning the cam and permitting the weight to close the valve. The piston-valve because of its peculiar construction slides very freely, and directly it and the disk valve have descended the full pressure of steam comes on the under side of the slidable follower. The follower is pressed upward and causes the packing-rings to fit steam-tight around the piston-valve so that no steam can pass, and the hoisting mechanism is thereby stopped.

WV hat I claim is 1. In a valve, the combination, with a casing having a valve-seat in its upper part and an annular recess in its lower part, of a valvestem, a disk valve on the said stem for closing the passage through the said seat, a piston-valve on the said stem provided with a steam-passage, a packing-ring in the said annular recess around the said piston-valve, and a slidable follower which retains the said packing-ring in position.

2. In a valve, the combination, with a casing having a valve-seat in its upper part and an annular recess in its lower part, of a valvestem which projects from the said casing, a weighted operating-lever connected with the said stem, a trip-lever and a cam which normally hold the said operating-lever in a raised position, a disk valve secured on the said stem and operating to close the passage through the valve-seat, a piston-valve provided with a steam-passage and secured on the said stem below the disk valve, a packing-ring in the said annular recess around the said pistonvalve, and a slidable steam-operated follower working in the said annular recess and retaining the said packing-ring in position.

3. In a valve, the combination, with avalvecasing having a seat for a disk valve in its up per part and a cylinder for a piston-valve in its lower part, of a valve-stem, a disk valve and a piston-valve secured on the said stem, said piston-valve being provided with alateral steam-passage, and means for keeping the said piston-valve steam-tight in its cylinder when the said disk valve is on the said seat.

In testimony whereof I have afiixed my sig' nature in the presence of two witnesses.

WlNFlELD O. GUN CKEL.

\Vitnesses:

WILLIAM S. JOHNSTON, FRANK U. KUHN. 

